Centrifugal governor



Apr. 1'7, 1923. A H,F.DOBHN i v QENTRIFUGAL GovRNoR v Filed Deo. 6, 1920HENRY E. DOBBIN, or NEw YORK, N. Y.,

Patented Apr. "f7, 1923.

ritiri INCORPORATED, OF NEVJ YORK,

ASSIGNORTO WESTERN ELECTRIC COMPANY, N. Y., A CORPORATIONOF `lTZEliVYORK.

` CENTEIEUGAL GOVERNOR.

Application filed December 6, 1920. Serial No. 428,695.

To all whom it may concern.'

Be it known that I. HENRY F. DOBBIN, a citizen of the United States,residing at New York, in the county of New York, State of New York, haveinvented certain new and useful improvements in Centrifugal Governors,of which the following is a full,y clear, concise7 and exactdescription.

This invention relates to centrifugal speed regulators ory governors andis especially concerned with certain improvements whereby adjustment ofthe operating speeds thereof is facilitated.

An object in view is to simplify the operation Of adjusting the speed ofgovernors such as are used on impulse senders of the type employed inautomatic telephone practice. The Operation of these impulse sendersmust be regulated quite accurately in order that the impulses shall bepropagated neither too fast nor too slow. Adjustments are frequentlymade by moreor less unskilled workmen and it is accordingly desirablethat all complications and necessity for the use of special tools beeliminated.

In accordance with the above object, one feature of the presentinvention consists in the provision of an adjustable arm attached to thegovernor fiy-weight to which arm a retractile spring for restraxtningthe flyweight is in turn attached. The movement of the adjustable arm inone direction or the other will effect an increase or decrease in thespeed of the governor depending upon which way the arm is moved. Thead'ustable arm is preferably arranged to be bent to effect anadjustment, but it may be arranged otherwise to accomplish the sameresti-lt as will be pointed out hereinafter.

A further feature is the. provision of an indicator and a calibratedscale therefor for directing the adjuster as to which way the adjustablearm should be moved in order to increase or decrease the speed of thegovernor as desired. The indicator is preferably in the form of apointer attached to or integral with the adjustable arm and thecalibrated scale is preferably stamped or engraved on the fly-weight.

Referring to the accompanying drawing, Fig. 1 is a view of an impulsesender or what is more frequently termed a calling device. A device ofthis character is described in det-ail in U. S. Patent No. 1,286,982 toO. F. Forsberg. Fig. 2 is a partial view taken at the rear of thecalling device shown in Fig. 1. Fig. 3 is a perspective view of agovernor embodying the present invention. Fig. 4: is a perspective viewof a modified form of governor also embodying the present invention.Fig. 5 shows a modification of the form shown in Fig. 3. Fig. 6 is arearview of Fig. 3.

As set forth in the above mentioned Forsberg patent the calling devicecomprises a rotatable dial provided with a circular row of finger holds.ln Fig. 1, the dial is not shown but the positions of the finger holdsare indicated by the dot and dash circles 5. The dial when rotated in aclockwise direction winds up a motor spring. The impulse mechanismremains dormant during the clockwise operation of the dial, but when thelatter is released, it returns to its normal position by virtue of theaforementioned.

motor spring during which return movement the impulse mechanism isoperated.

As the speed at which the impulses are sent is required to be properlyregulated and uniform, the return movement of the dial must beaccurately governed. `Upon aclockwise rotationof the dial, gearr 6 islikewise rotated in the same direction. The rotation of gear 6 istransmitted through pinion 7 and gear 8 through'pinion 97 which is alsorotated ina clockwise direction. Pinion 9 is'loosely mounted on shaft 10and is therefore ineffective during the clockwise movement of the dial.Upon the return movement of the dial, however. pinion 9 engages pawl 11and carries the latter around with it. vllzawl 11 is pivotally mountedon a spider 12 which is secured to shaft 10. The moving parts of thegovernor are mounted on spider 12; these comprise fly-weights 13 to eachof which is attached an adjusting arm 14 between which is connected aretractile spring 15. The arm 14 is substantially parallel to the chordseX- tending between the ends of the arc-shaped weight 13.

ln Fig. 3, the fly-weights are pivoted on pin 16 about which theyrotateunder the action of centrifugal force when the governor is rotated. Inthe arrangement illustrated in Fig. 4, the fly-weights are seatednormally on arms 12 which are integral with spider 12.

The adjusting arms 14 are each provided with a pointer 14 and there is acalibrated scale on each fly-weight which co-operates with the pointer.The letters F and S, meaning Fast and Slow77 respectively are inscribedat the extremities of the scale. By bending either of the adjustingarms, the speed at which the governor will run and accordingly the speedat which the impulses are sent out may be varied as described. Toincrease the speed the adjuster has merely to bend one of the adjustingarms so as to move the pointer toward the designation F. He thusincreases the tension of spring thereby more eectively resisting theforce tending to throw the ily-weights outwardly when the governor isrotating. A decrease in the speed is accomplished in the reversedmanner. An ordinary pair of linemans pliers is the only tool required tomake an adjustment.

Each fly-Weight is provided with a friction insert 17, preferably ofcork. The governor when assembled in a calling device is mounted' in astationary casing 18 and during rotation the cork inserts rub againstthe inner surface of the casing thus retarding the motion of thegovernor. Any acceleration of the speed of rotation tends to throw thefly-weights further from the center thus increasing the pressure withwhich the inserts 17 bear against the casing. The resistance to rotationis thus increased and tends to off-set the increased force of rotationand maintain the speed at a substantially constant value.

In the drawing both {iv-weights are provided with adjusting arms 14C,but it is not necessary that both be so provided. If desired only oneily-weight need be provided with an adjusting arm in which case one endof spring 15 would be attached directly to one of the {1y-weights as inFig. 5 and the other end to the adjusting arm 14 as illustrated in Fig.3. For practical reasons it is deemed preferable to provide theadjusting arm on both fly-weights.

What is claimed is:

1. A governor comprising a pair of oppositely disposed fly-weights, apair of adjust- .ing members, one for each fly-weight and each attachedto its respective fly-Weight, an .indicator for each adjusting'member,said indicators integral with said adjusting members, a retractilespring connected between said adjusting members and adapted to restrainsaid iiy-weights against centrifugal motion and acalibrated scale oneach iiyweight, for cooperating with the respective indicators.

2. A centrifugal governor comprising an arc-shaped fly-weight, anadjustable member attached to one end of said weight and substantiallyparallel to a chord extending between the ends thereof, and arectractile spring attached to said member and adapted to restrain saidfly-weight against centrifugal motion.

3. A centrifugal governor comprising an arc-shaped ily-weight, anadjustable member supported on one of said weight and substant-iallyparallel to a chord extending between the ends thereof, a secondiiyweight, a retractile spring attached to said adjustable member andadapted to restrain both fly-weights against centrifugal motion.

et. A centrifugal governor comprising astationary member having aninternal annular surface, a rotatable member in coaxial alignment withsaid stationary member.` said rotatable member comprising a pair ofpivoted fly-weights, a friction stud on each of said fly-weightsarranged to frictionallj;y engage said internal annular surface, apliable arm attached to at least oue of said flyweights, and aretractile spring for restraining said fly-weights against centrifugalforce, said retractile spring being attached to said pliable arm, theoperating direction of rotation of said rotatable member being such thatsaid friction studs move in advance of the pivotal points of theirrespective fly-weights.

ln witness whereof, I hereunto subscribe my name this 29th day ofNovember, A. D

HENRY F. DOBBIN.

